The defects in the macros UPDATE_VF_STAT and UPDATE_VF_STAT_36BIT exist.
If latest is less than last, we will get wrong result.
The patch fixes the defect.
Fixes: d15fcf76c8b7 ("e1000: move to drivers/net/")
Cc: sta...@dpdk.org
Signed-off-by: Guinan Sun <guinanx....@intel.com>
---
drivers/net/e1000/igb_ethdev.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/drivers/net/e1000/igb_ethdev.c b/drivers/net/e1000/igb_ethdev.c
index 520fba8fa..d6032fd65 100644
--- a/drivers/net/e1000/igb_ethdev.c
+++ b/drivers/net/e1000/igb_ethdev.c
@@ -47,6 +47,8 @@
#define IGB_4_BIT_MASK RTE_LEN2MASK(IGB_4_BIT_WIDTH, uint8_t)
#define IGB_8_BIT_WIDTH CHAR_BIT
#define IGB_8_BIT_MASK UINT8_MAX
+#define IGB_32_BIT_WIDTH (CHAR_BIT * 4)
+#define IGB_32_BIT_MASK RTE_LEN2MASK(IGB_32_BIT_WIDTH, uint32_t)
/* Additional timesync values. */
#define E1000_CYCLECOUNTER_MASK 0xffffffffffffffffULL
@@ -263,9 +265,15 @@ static int igb_filter_restore(struct rte_eth_dev *dev);
*/
#define UPDATE_VF_STAT(reg, last, cur) \
{ \
- u32 latest = E1000_READ_REG(hw, reg); \
- cur += (latest - last) & UINT_MAX; \
- last = latest; \
+ uint64_t latest = E1000_READ_REG(hw, reg); \
+ uint64_t stat = 0; \
+ if (latest >= last) \
+ stat = latest - last; \
+ else \
+ stat = (uint64_t)((latest + \
+ ((uint64_t)1 << IGB_32_BIT_WIDTH)) - last);\
+ cur += stat & IGB_32_BIT_MASK; \
+ last = latest; \
}
#define IGB_FC_PAUSE_TIME 0x0680
--
2.17.1
